Thanks for all of the responses. I was really surprised at how many people were told not to double. Just to add another inconsistency in advice given by our trusted endo's, I was told to double. I phoned his endo's office regarding the runny nose, and of course the Dr. was unavailable. His regular clinical nurse, is on holidays so I spoke to the person covering for her. She advised if there was no fever, and he was his usual self to go ahead with the shot. The nurse giving the shot checked him for fever, and agreed he appeared to be quite healthy. So it is done, and now I am crossing my fingers that the runny nose is just teething, and that he won't have any side effects from the shot. THANKS EVERYONE!!!